/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package lv.pig.base.shiro;

import java.io.Serializable;
import java.util.List;

import lv.pig.base.jpa.entity.SystemRole;
import lv.pig.base.jpa.entity.User;
import lv.pig.base.jpa.service.RoleService;
import lv.pig.base.jpa.service.UserService;

import org.apache.shiro.authc.AuthenticationException;
import org.apache.shiro.authc.AuthenticationInfo;
import org.apache.shiro.authc.AuthenticationToken;
import org.apache.shiro.authc.SimpleAuthenticationInfo;
import org.apache.shiro.authc.UnknownAccountException;
import org.apache.shiro.authc.UsernamePasswordToken;
import org.apache.shiro.authz.AuthorizationInfo;
import org.apache.shiro.authz.SimpleAuthorizationInfo;
import org.apache.shiro.realm.AuthorizingRealm;
import org.apache.shiro.subject.PrincipalCollection;
import org.apache.shiro.util.ByteSource;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.DependsOn;
import org.springframework.util.CollectionUtils;

@DependsOn(value = {"userService", "roleService"})
public class ShiroDbRealm extends AuthorizingRealm implements Serializable
{
    
    private static final long serialVersionUID = -1748365967887290245L;
    
    @Autowired
    UserService userService;
    
    @Autowired
    RoleService roleService;
    
    /**
     * 认证回调函数,登录时调用.
     */
    @Override
    protected AuthenticationInfo doGetAuthenticationInfo(AuthenticationToken authcToken)
        throws AuthenticationException
    {
        UsernamePasswordToken token = (UsernamePasswordToken)authcToken;
        String username = token.getPrincipal().toString();
        User user = userService.findByLoginName(username);
        if (null == user)
        {
            
            throw new UnknownAccountException();
        }
        
        String principal = username;
        String hashedCredentials = user.getPassword();
        ByteSource credentialsSalt = ByteSource.Util.bytes(user.getName() + user.getSalt());
        String realmName = getName();
        
        SimpleAuthenticationInfo authentication =
            new SimpleAuthenticationInfo(principal, hashedCredentials, credentialsSalt, realmName);
        return authentication;
    }
    
    /**
     * 授权查询回调函数, 进行鉴权但缓存中无用户的授权信息时调用.
     */
    @Override
    protected AuthorizationInfo doGetAuthorizationInfo(PrincipalCollection principals)
    {
        User user = (User)principals.getPrimaryPrincipal();
        SimpleAuthorizationInfo info = new SimpleAuthorizationInfo();
        List<SystemRole> roles = roleService.findByUserId(user.getId());
        if (!CollectionUtils.isEmpty(roles))
        {
            for (SystemRole role : roles)
                info.addRole(role.getId() + role.getRoleName());
        }
        // 可加其他权限
        // info.addStringPermissions(buttonService.findButtonCodesByUserId(user.getId()));
        return info;
    }
       
}
